Physics-Please help

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If I have a roller coaster, and hill 1 height is 50cm and hill height 2 is 25 cm and the PE is .9 as it approaches the top of hill 2, how do I calculate the speed.

Please help

  • Physics-Please help -

    THe PE is .9 where? Where did the coaster start?

  • Physics-Please help -

    The coaster started at .18PE-the .9 is the PE at the top of the second hill.The second hill is lower.

  • Physics-Please help -

    Well, the difference in the two Potential energies is now KEnergy, 1/2 mv^2, solve for v.

  • Physics-Please check -

    . The way to calculate this is you take the KE would be .9. You would say .9 = ½ (.035 x v^2) = 2.215. Correct or no?

  • Physics-Please check -

    Should I have done this as 1/2mv^2 = mgh
    Cross out like terms and get to v^2 = square root of 2 x g x .25m(h)= 2.125 m/s

    Would this be correct?

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